Nami/Personality and Relationships, One Piece Wiki

Along with Nico Robin, Usopp, Sanji, Tony Tony Chopper, and Franky, Nami is one of the smartest of the Straw Hats. And according to an SBS from volume 8 (1999), Oda said that "of all the characters introduced so far in One Piece" Nami was the third smartest character in the East Blue (the first is Benn Beckman of the Red Hair Pirates, the 2nd being Captain Kuro). Though given how few characters were introduced and properly developed at that time, that quote should be taken with a grain of salt.

I like the effect the crew's antics has had on Nami, despite being one of the more serious members. : r/OnePiece

One Piece anime fans boycott the Nami gag after 20 years

Best older sibling one piece? : r/OnePiece

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